Fuel system
-- Excessive fuel pressure.
-- Leaking fuel injector(s).
-- Leaking fuel pressure regulator.
-- Low fuel pressure.
-- Contaminated injector(s)
Computer still calibrated to thinking the CNG is still there. Now it reads a value wrong and throws this code. What we need here is to find the other computer from the install (there was one right?) or swap his computer with yours Jeff to see if it drops the cel. I'm really leaning towards a programming issue now. Nothing is different from a stock set up now from what I can tell at this point. Is that agreeable?